Yes, caul is a Scrabble word!
...and is worth 6 points in Scrabble, and 9 points in Words with Friends
caul
Noun
1. Part of the peritoneum attached to the stomach and to the colon and covering the intestines
2. The inner membrane of embryos in higher vertebrates (especially when covering the head at birth)
What Scrabble words can I make with the letters in caul?
3 Letter Words
2 Letter Words